BY FREDERICK A. A. SKUSE. 43 



sessile, with short verticils. (The sub-geuus GlinovTiyncha, Loesv, 

 has been formed of the Lasiopterce having the mouth prolonged 

 in a rostrum.) 



Cecidomyia, Meigen. 



I. Wings with three longitudinal veins, the third either forming 

 a fork, or becoming more or less obsolete towards the tip. 



A. Cross-vein placed between the root and the tip of the first 

 longitudinal vein (in this section the cross-vein is frequently 

 almost obsolete). 



Cecidomyia, Loew. — The second longitudinal vein reaches the 

 margin of the wing a little before its tip (although in most cases 

 the distance is very short). Generally the same number of joints 

 in the antennae of the ^ and 9 ; joints either pedicelled or sessile 

 (sometimes pedicelled in the ^ and sessile in the 5 ', sometimes of 

 the same structure, pedicelled or sessile, in both sexes). 



Diplosis, Loew. — The second longitudinal vein reaches the 

 margin of the wing at or beyond its tip. Antennse of the ^ 26- 

 (2 + 24) jointed, sometimes with one rvidimental joint more ; joints 

 pedicelled, simple joints alternating with double ones, seldom all 

 joints simple. Antennse of the 9 14- (2 4- 12) jointed, sometimes 

 with one rudimental joint more ; joints pedicelled, cylindrical. 



Asphondi/lia, Loew. — The second longitudinal vein reaches the 

 margin of the wing a little beyond its tip. Antennte of both 

 sexes with the same number of joints ; the latter cylindrical, 

 sessile, with a .short pubescence and without verticils. 



Hormomyia, Loew. — Tlie second longitudinal vein reaches the 

 margin of the wing either at or beyond the tip. Thorax more or 

 less gibbose, frefpiently extending over the head in the form of a 

 hood. Joints of the $ anteunte pedicelled ; those of the 9 

 pedicelled or sessile. 



Coljjodia, Winn. — The second longitudinal vein forms a curve 

 Ijefoi'o the cross-vein and joins the margin a little beyond the tip 

 of the wing. Cros.s-vein rather large, oblicjue. 



B. Cross-vein very oblique, originating at the root of the first 

 longitudinal vein. 



